Gas-burner for casting-machines.



M. C. INDAHL.

GAS BURNER. F-OR CASTING MACHINES. APPLICATION FILED AUG-1| 1915.

Patented Mar. 20,1917.

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M. C. INDAHL. GAS BURNER FOR CASTING MACHINES.

APPLICATION FILED AUG-7 1915- 1,220,128. Patented Mar. 20, 1917.

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UNITED STATES PATENT OFFICE.

MAURITZ C. INDAHL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 LANSTON MONOTYPE MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION 0F VIRGINIA.

GAS-BURNER FOR CASTING-MACHINES.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed August 7, 191-5. Serial No. 44,314.

To all whom it may concern:

Be it known that I, MAURITZ O. INDAI-IL, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Gas-Burners for Casting-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to the melting pot mechanism of metal casting machines, and is designed more especially for application to type casting machines, such as are used in the well known Lanston monotype system, a machine of this character being illustrated in the patent granted to J. S. Bancroft, 625,998, dated May 30, 1899.

In machines of the type specified the melting pot, together with the pump and the immediately associated parts including the heater, are mounted? on a swing frame which is vertically adjustable, whereby the melting pot may be brought into position for the nozzle to seat in the mold and whereby the parts may be lowered and turned off to one side. for inspection, adjustment or repair. These conditions of use have'rendered it somewhat difficult to provide an eflicient form of heating mechanism and the present invention is designed not only to overcome defects such as have heretofore existed in the construction of the heating mechanism, but to provide a mechanism of this character which may be manufactured conveniently and economically and which, when located in position, will not thereafter require or permit of adjustment by the individual attendant.

Referring to the accompanying draw- Figure 1 isa sectional elevation showing portions of a swing frame, melting pot and heating mechanism embodying the present improvements.

Fig. 2 is a top plan view of the burners.

Fig. 3 is a perspective View of the group of mixing tubes.

Fig. 4 is a similar View of the burner base j ct nozzles and valves in posi- Like characters of reference throughout' the several figures indicate the same parts.

Referring particularly to Fig. 1, the melting pot itself is indicated by the reference numeral 2, and the casing which forms the wall of the flue for the heated products is indicated by the numeral 3. These parts are mounted on a swing frame l, the latter being carried by a vertical shaft 5 mounted in fixed supports 6. The whole swing frame is adapted to turn on the vertical axis of the shafto and'to be adjusted vertically on said axis by mechanism which it is not deemed necessary to illustrate herein, inasmuch as the same is well understood.

The lower portion of the melting pot casing 8 is provided with a downwardly extending lip or flange 7 within which the upper ends of a group of burners project in position for the flame at the ends of said burners to impinge directly against the of combustion to flow off: through the casing to a suitable stack or pipe as usual. In accordance with the present invention, the burners embody a group of mixer tubes, preferably 3, numbered. 8, 9 and 10, all forming part of an integral casting embodying an intermediate web 11 at one side of which is a vertically extending bracket 12. I The bracket 12 is provided with a vertically extending undercut or T-head slot 13, adapted for the reception of the head of a bolt 14 passing through the vertical wall of the swing frame 4,.as shown in Figs. 1 and .2, whereby the group of mixer tubes 1 is firmly attached to the swing frame and tubes 8, 9 andlO. At one side it. is formed with an upwardly extending webbed bracket 16 adapted to be secured in place by a screw 17 passing through the bracket and into the web 11 uniting the group of mixer tubes; thus, the whole burner including the tubes and base are rigidly connected together and as a single unit held in place by the bolt 14- passing through the vertical wall of the swing frame. The burner base 15 is formed with an internal gas pocket or chamber 18, the contour of which is shown by the dotted lines in Fig. 2, and in said base, in line with each of the tubes 8, 9 and 10, there is formed a seat or socket for the reception of a gas cock 19. The latter is usually of conical form so that it may be ground to its seat and retained in position by a nut 19, for example, applied to the downwardly extending end, as shown clearly in Fig. 1. The cocks or valve 19 are each formed as the base for an upwardly extending gas nozzle 20 adapted to project up into the mixer tubes a proper distance for drawing in the desired percentage of air to form a completely combustible mixture. Each nozzle is provided with a laterally extending finger piece 21 whereby the valve or cook, in conjunction with the nozzle, may be turned to regulate the flow of gas through the nozzle, it being understood, of course, that suitable passages are formed in the burner base leading from each valve seat to the central gas pocket or chamber 18. The lower ends of the mixture tubes are cut away as at 22 to provide a segmental opening through which the finger pieces 21 project in convenient position to be manipulated. A short distance above the lower ends said tubes are provided 'with air inlet openings 23, the size of which may be conveniently controlled by slip collars 2 1 held in adjusted. position on the tubes by set screws 25.

Gas is supplied through the central pocket or chamber of the base through a flexible duct 26 leading to an inlet nipple 27 in the bottom of the base and extending from a regulating valve 28 by which the flow of gas to all of the injector nozzles may be controlled.

The mixer tubes at their upper ends are provided with foraminous or gauze diaphragms 29 preferably held in place by being clamped between an annular cap 30 and the upper ends of the tubes, as shown in section in Fig. 1 in connection with the tube 8.

The gas injector nozzles and mixer tubes operate in the well known way to form a combustible mixture which is ignited at the upper ends of the tubes, and impinges 'against the bottom of the melting pot. Air is admitted through the openings at the bottom of the tubes and the nozzles are extended into the tubes a suliicient distance to guard against the escape of combustible mixture from the lower end, thus overcoming any tendency of the individual burners to pop back or ignite at the injector nozzles.

The whole burner is composed of but two main castings and three injector nozzles; thus, the expense of production is reduced to a minimum and the parts when united are not liable to be injured or disarranged in use, and at the same time the whole burner is adapted to be placed in position or removed as a unit by the simple manipulation of a single fastening bolt which secures the group of mixer tubes to the swing frame.

What is claimed is:

1. A heater for the melting pots of type casting machines, embodying a supporting frame forming the melting pot and burner support, a group of connected parallel vertical mixer tubes, vertically adjustable connections intermediate the body of tubes and frame, a burner base removably secured to and extending under the group of mixer tubes, an injector nozzle for each tube mounted in the base, a common supply chamber in the base with which all of the nozzles communicate, an individual gas regulator valve for each nozzle, a gas supply for the chamber, and a valve for regulating the gas supplied to the chamber.

2. A heater for the melting pots of type casting machines, embodying a group of parallel mixer tubes connected together and provided with a laterally extending supporting bracket, a separate burner base rigidly connected with and extending under the mixer tubes and having valve sockets formed therein in line with the tubes, a common gas supply chamber located within the base and in communication with each of said sockets, a gas valve located in each socket and having an upwardly extending injector nozzle, means for moving said valves in their sock ets, and means for supplying gas to the central supply chamber.

3. A heater for melting pots of type casting machines, embodying an integral group of parallel mixer tubes formed with a laterally extending supporting bracket, a separate burner base rigidly connected with said group of mixer tubes and extending under the lower ends thereof, said base having formed therein in line with each of the mixer tubes a valve socket or seat and also having formed therein a central gas supply chamber in communication with each of said valve sockets or seats, a combined valve and injector nozzle journaled in each seat and extending into the mixer tube in alinement therewith, and finger pieces for adjusting the individual valves for controlling the fiow of gas through the injector nozzle.

4. In a heater for melting pots of type casting machines, the combination with a vertically arranged mixer tube, a burner base secured rigidly to and extending under. and held in place by a fastening applied the lower end of said tube, said burner base thereto on the under side of the base, said 10 having an upwardly flaring conical valve valve having an upward extension centrally socket formed therein, With an opening exthereof forming an injector nozzle within tending therefrom through to the under the tube and a lateral extension on the nozzle side of the base, and a supply passage comabove the base forming a finger piece at one municating With said socket, of a downside of the tube, substantially as described. 15 Wardly tapering Valve seated in said socket MAURITZ C. INDAHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

